Anode foil production apparatus and method for aluminum electrolytic capacitors

Abstract

This application discloses an apparatus and method for producing anode foil for aluminum electrolytic capacitors, belonging to the field of anode foil production apparatus. It is used for anode foil production and includes a drying chamber containing one or two drying cylinders connected in series. Each drying cylinder includes a box body connector distributed circumferentially around the anode foil and a gas distribution box connected to an inlet pipe. The box body connector has an inlet end cap and an outlet end cap fixed at both ends, and the gas distribution box has an outlet. It also includes an outer cylinder and an inner cylinder, with the inner cylinder located inside the outer cylinder and coaxially arranged with it. The ends of the outer and inner cylinders are connected to the inlet and outlet end caps via bearing structures. The outer cylinder has a plurality of outer cylinder distribution holes distributed on its circumferential outer wall, and the inner cylinder has end rings at both ends, with a plurality of inner cylinder blades arranged between the end rings. This application enables effective drying of the anode foil during the anode foil production process, helping to improve drying efficiency and quality.

Description

Technical Field

[0001] This application belongs to the field of anode foil production equipment, and more specifically, relates to an apparatus and method for producing anode foil for aluminum electrolytic capacitors. Background Technology

[0002] In the production process of anode foil for aluminum electrolytic capacitors, the anode foil is one of the core components. Its surface quality and structural stability are directly related to the performance and service life of the capacitor. In the production process of anode foil, the drying process has a significant impact on the production quality of the anode foil.

[0003] Referring to Chinese Patent Publication No. CN121748186A, a production apparatus and method for anode foil of aluminum electrolytic capacitors are disclosed, specifically revealing the following technical solution: A base component is included, comprising a base, a gantry frame mounted on top of the base, and a perforated conveyor belt installed inside the base; a drying assembly is installed inside the gantry frame, comprising an upper drying chamber fixedly connected to the gantry frame, with an upper drying rod at the bottom of the upper drying chamber; a lower drying chamber is fixedly connected to the base, located in the middle of the perforated conveyor belt, with a lower drying opening above the lower drying chamber; Addressing the aforementioned shortcomings of the prior art, the prior art provides a production apparatus and method for anode foil of aluminum electrolytic capacitors, effectively solving the problems of excessive airflow impact during drying leading to anode foil deformation, surface damage, and changes in material properties due to localized high temperatures.

[0004] However, the applicant believes that there is room for improvement in the control of airflow stability during the drying process and in reducing the impact of airflow on the anode foil. Therefore, the applicant decided to improve the drying components in the drying chamber to better dry the anode foil and improve drying efficiency and quality. Summary of the Invention

[0005] The purpose of this application is to provide an apparatus and method for producing anode foil for aluminum electrolytic capacitors, which can effectively dry the anode foil during the anode foil production process, thereby improving drying efficiency and quality.

[0006] To achieve the above objectives, this application employs the following technical solution: A production apparatus for anode foil of aluminum electrolytic capacitors includes a drying chamber. Inside the drying chamber, one or two drying cylinders connected in series are mounted on a frame. Each drying cylinder includes box-shaped connecting parts distributed circumferentially around the anode foil. Inlet and outlet end caps are fixedly mounted at both ends of the box-shaped connecting parts. A gas distribution box is located between adjacent box-shaped connecting parts and is connected to an inlet pipe. An outlet is located on the inner wall of the gas distribution box facing the anode foil. An outer cylinder and an inner cylinder are also arranged within the space enclosed by the gas distribution box and the box-shaped connecting parts. The inner cylinder is located inside the outer cylinder and is coaxially arranged with it. The two ends of the outer and inner cylinders are connected to the inlet and outlet end caps via bearing structures. The outer cylinder has a plurality of outer cylinder distribution holes distributed on its circumferential outer wall. The two ends of the inner cylinder are end rings, and a plurality of inner cylinder blades are arranged between the end rings.

[0007] In this application, the inlet end cap is provided with an inlet guide roller at the inlet position of the anode foil, and the outlet end cap is provided with an outlet guide roller at the outlet position of the anode foil.

[0008] In this application, the gas distribution box and the box body connector form a cylindrical structure with open ends in the circumferential direction of the anode foil. The gas distribution box is a hollow box body. A box body outlet composed of strip-shaped through holes is provided on the inner wall of the gas distribution box facing the anode foil. The gas inlet pipe is connected to the gas distribution box through the gas inlet box. The gas inlet box is located at the end of the gas distribution box, and the gas distribution box is connected to the inlet end cover through the gas inlet box.

[0009] In this application, the gas inlet box is provided with a plurality of gas inlet distribution holes at a position communicating with the gas distribution box; the gas distribution box is provided with a distribution partition corresponding to the gas outlet of the box body, and the distribution partition divides the interior of the gas distribution box into chambers corresponding to the gas outlet of the box body.

[0010] In this application, the housing connector is provided with a power shaft at the end that connects to the outlet end cover. The housing connector is connected to the outlet end cover via the power shaft. The power shaft is connected to an inner drive wheel and an outer drive wheel via a bearing structure. The inner drive wheel engages with the end ring of the inner cylinder for transmission, and the outer drive wheel engages with the end of the outer cylinder for transmission. The inner drive wheel and the outer drive wheel are respectively connected to an external power device via a synchronous belt.

[0011] In this application, the inner cylinder fan blades are located between the end ring and the outer cylinder, and between the end ring and the anode foil, respectively. The inner cylinder fan blades are composed of two arc-shaped plates in opposite directions.

[0012] In this application, the outer cylinder and inner cylinder are multiple segments, and the multiple outer cylinder segments and the multiple inner cylinder segments are connected as a whole and coaxially arranged by their respective cylinder connecting plates.

[0013] A method for producing anode foil for aluminum electrolytic capacitors, comprising: the anode foil entering a gas distribution box and a space enclosed by a gas distribution box and a box connector through an inlet guide roller and an inlet end cap; the inlet pipe being connected to an external drying gas pipeline; the drying gas in the inlet pipe being distributed into the gas distribution box through an inlet distribution hole; the drying gas entering the corresponding box outlet under the action of a distribution baffle in the gas distribution box; the box outlet distributing the drying gas into the space enclosed by the gas distribution box and the box connector; the inner and outer cylinders rotating under the drive of corresponding inner and outer drive wheels, the inner and outer cylinders being coaxial and rotating in opposite directions around a central axis; the inner cylinder fan blades distributing the drying gas to the anode foil and discharging the drying gas through the gap between the outer and inner cylinders and the outlet end cap; the anode foil being guided out of the drying box or the inlet guide roller in the next drying cylinder for secondary drying through the outlet on the outlet end cap and the outlet guide roller at the outlet position.

[0014] Compared with the prior art, the beneficial effects of this application are: This application achieves continuous drying of the anode foil during the conveying process by redesigning the internal structure of the drying chamber, and fully improves the continuous and stable contact and flow of the drying gas with the anode foil, reducing the impact on the anode foil during the drying process. The continuous and stable contact and flow of the drying gas can improve the drying efficiency and quality of the anode foil. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the drying cylinder in this application. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the drying cylinder in this application. Figure 2 .

[0017] Figure 3 yes Figure 2 A magnified view of part I in the middle.

[0018] Figure 4 Is Figure 3 The structural diagram after removing the outlet end cap is based on the original design.

[0019] Figure 5 This is the main view of this application.

[0020] Figure 6 yes Figure 5 A cross-sectional view at the position and direction shown in AA.

[0021] Figure 7 This is a schematic diagram of the structure of the entrance location after removing the entrance end cap.

[0022] Figure 8 Is Figure 7 The structural diagram is based on the previous one, with some parts of the air intake box removed.

[0023] Figure 9 Is Figure 8 This is a schematic diagram showing the internal structure of the gas distribution box.

[0024] In the diagram: 1. Anode foil; 2. Inlet guide roller; 3. Inlet end cap; 4. Inlet pipe; 5. Inlet box; 6. Gas distribution box; 7. Box body connector; 8. Power shaft; 9. Inner drive wheel; 10. Outer drive wheel; 11. Outlet end cap; 12. Outlet guide roller; 13. Inner cylinder; 14. Outer cylinder; 15. Box body outlet; 16. End ring; 17. Inner cylinder fan blade; 18. Outer cylinder distribution hole; 19. Inlet distribution hole; 20. Distribution baffle; 21. Cylinder body connecting plate. Detailed Implementation

[0025] The technical solution of this application will be described in detail below with reference to the accompanying drawings. The directional terms that appear in the following paragraphs, including but not limited to "up, down, left, right, front, and back", are only used to help those skilled in the art to understand the technical solution in conjunction with the orientation of the accompanying drawings, but they should not be construed as limiting the scope of protection of this application.

[0026] Example 1: See Figures 1 to 9 A device for producing anode foil for aluminum electrolytic capacitors includes a drying oven. Inside the drying oven, one or two drying cylinders are mounted on a frame. Circular plate-shaped inlet caps 3 and outlet caps 11 are respectively mounted at both ends of the drying cylinders. Alternating gas distribution boxes 6 and box connectors 7 are arranged between the inlet caps 3 and outlet caps 11. The gas distribution boxes 6 and box connectors 7 surround the inlet caps 3 and outlet caps 11 to form a space for the anode foil 1 to pass through. The two ends of the box connectors 7 and the gas distribution boxes 6 are respectively connected to the corresponding inlet caps 3 and outlet caps 11. The gas distribution box 6 is a hollow box, with an inlet pipe 4 connected to one end. Several box outlets 15 are provided on the inner wall of the gas distribution box 6 facing the anode foil 1. The space enclosed by the gas distribution box 6 and the box body connector 7 also includes an outer cylinder 14 and an inner cylinder 13 coaxially arranged. The inner cylinder 13 is located inside the outer cylinder 14, and the anode foil 1 passes through the inside of the inner cylinder 13. The outer cylinder 14 has several outer cylinder distribution holes 18 on its circumferential outer wall. The inner cylinder 13 has end rings 16 at both ends, and adjacent end rings 16 are connected by several inner cylinder fan blades 17. The inner cylinder 13 and the outer cylinder 14 rotate relative to the gas distribution box 6 and the box body connector 7.

[0027] In Embodiment 1, the inlet end cap 3 and the outlet end cap 11 are used to connect the gas distribution box 6 and the box body connector 7, as well as to connect the inlet guide roller 2 and the outlet guide roller 12, and to guide the anode foil 1.

[0028] In Embodiment 1, the box connector 7 is used to ensure the stability of the overall structure, and the box connector 7 is evenly distributed around the inlet end cover 3 and the outlet end cover 11 in the circumference, with sufficient distance between adjacent box connectors 7 for the installation of the gas distribution box 6.

[0029] In Embodiment 1, the gas distribution box 6 is located between adjacent box connectors 7. The gas distribution box 6 is a hollow box, and its purpose is to transport drying gas into the space formed by the gas distribution box 6 and the box connectors 7 to achieve the drying of the anode foil 1.

[0030] In Embodiment 1, the gas distribution box 6 is provided with an air inlet pipe 4 at the end near the inlet end cover 3. The air inlet pipe 4 is used to connect with an external gas supply pipeline to introduce drying gas into the gas distribution box 6.

[0031] In Embodiment 1, the gas outlet 15 of the box body is located on the inner wall of the gas distribution box 6 facing the anode foil 1, and the gas outlet 15 is evenly distributed around the circumference of the anode foil 1. The length of the gas outlet 15 can be close to the length of the gas distribution box 6, or the gas outlet 15 can be continuously distributed along the length direction of the gas distribution box 6.

[0032] In Embodiment 1, the outer cylinder 14 is a cylindrical structure open at both ends. The two ends of the outer cylinder 14 are connected to the inlet end cap 3 and the outlet end cap 11 at corresponding positions through bearing structures to achieve rotation relative to the above structure. The outer cylinder 14 has a plurality of outer cylinder distribution holes 18 distributed on its circumferential sidewalls. The outer cylinder distribution holes 18 can evenly distribute the drying gas sent in by the air outlet 15 of the box into the internal space of the outer cylinder 14.

[0033] In Embodiment 1, the inner cylinder 13 is located in the internal space of the outer cylinder 14 and is coaxially arranged relative to the outer cylinder 14. The two ends of the inner cylinder 13 are rotatably connected to the inlet end cap 3 and the outlet end cap 11 at the corresponding positions through a bearing structure, so as to realize the relative rotation of the inner cylinder 13 with the inlet end cap 3 and the outlet end cap 11.

[0034] In Embodiment 1, the inner cylinder 13 includes end rings 16 coaxially arranged at both ends. Adjacent end rings 16 are connected as a single unit by inner cylinder fan blades 17, which are distributed circumferentially around the end rings 16. The end rings 16 near the inlet end cover 3 are connected to the inlet end cover 3 via a bearing structure, and the end rings 16 near the outlet end cover 11 are connected to the inlet end cover 3 via a bearing structure. The anode foil 1 is enclosed in the space formed by the inner cylinder fan blades 17.

[0035] Example 2: Based on Example 1, see below. Figures 1 to 9 An apparatus for producing anode foil for aluminum electrolytic capacitors is disclosed. The inlet end cap 3 is equipped with an inlet guide roller 2 at its inlet position, through which the anode foil 1 enters the inlet of the inlet end cap 3. The outlet end cap 11 is equipped with an outlet guide roller 12 at its outlet position, through which the anode foil 1 exits. The gas outlet 15 of the gas distribution box 6 is a strip-shaped through-hole extending along the length of the gas distribution box 6. Multiple gas outlets 15 can be provided on one gas distribution box 6. An inlet box 5 is provided at the end of the gas distribution box 6 near the inlet end cap 3. An inlet distribution hole 19 is provided at the connection point between the inlet box 5 and the gas distribution box 6. The inlet box 5 is connected to an inlet pipe 4. The gas distribution box 6 is fixedly connected to the inlet end cap 3 via the inlet box 5. The gas distribution box 6 is equipped with distribution partitions 20 corresponding to the number of air outlets 15 in the box. The distribution partitions 20 divide the gas distribution box 6 into chambers corresponding to the number of air outlets 15 in the box. The inner cylinder fan blades 17 include two arc-shaped plates with opposite bending directions. The purpose of the inner cylinder fan blades 17 is to direct the drying gas distributed by the outer cylinder 14 towards the anode foil 1.

[0036] In Embodiment 2, the inlet guide roller 2 is used to guide the anode foil 1, which can stably pass through the inlet end cap 3 under the guidance of the inlet guide roller 2.

[0037] In Embodiment 2, the outlet guide roller 12 is used to guide the anode foil 1, which can stably pass through the outlet end cap 11 under the guidance of the outlet guide roller 12.

[0038] In embodiment 2, the air outlet 15 of the box is a continuous strip-shaped through hole or a plurality of strip-shaped through holes continuously distributed along the length of the gas distribution box 6.

[0039] In embodiment 2, the gas distribution box 6 has an integrally formed air inlet box 5 at the end near the inlet end cap 3. The air inlet box 5 is connected to the air inlet pipe 4, and an air inlet distribution hole 19 is provided at the connection position between the air inlet box 5 and the gas distribution box 6. The drying gas delivered by the air inlet pipe 4 can be buffered in the air inlet box 5 and then evenly distributed into the gas distribution box 6 after passing through the air inlet distribution hole 19.

[0040] In embodiment 2, the distribution partition 20 is located inside the gas distribution box 6, and the gas distribution box 6 is divided into several chambers with the same number of chamber outlets 15 as the box body. The airflow introduced through the air inlet distribution hole 19 will enter the chamber outlet 15 under the guidance of the distribution partition 20.

[0041] In embodiment 2, the inner cylinder fan blade 17 can move relative to the anode foil 1 under the drive of the end ring 16, and under the drive of the end ring 16, it can send the gas from the outer cylinder distribution hole 18 to the position where the anode foil 1 is located, thereby reducing the direct impact of the airflow on the anode foil 1.

[0042] Example 3: Based on Examples 1 and 2, see below. Figures 1 to 9 A production apparatus for anode foil of aluminum electrolytic capacitors is disclosed, wherein the housing connector 7 is provided with a power shaft 8 at the end connected to the outlet end cover 11, and the housing connector 7 is connected to the outlet end cover 11 via the power shaft 8; the power shaft 8 is connected to an inner drive wheel 9 and an outer drive wheel 10 respectively via a bearing structure, the inner drive wheel 9 meshes with the end ring 16 of the inner cylinder 13 for transmission, and the outer drive wheel 10 meshes with the end of the outer cylinder 14 for transmission; the inner drive wheel 9 and the outer drive wheel 10 are respectively connected to an external power device via a synchronous belt. The inner cylinder fan blades 17 are located between the end ring 16 and the outer cylinder 14, and between the end ring 16 and the anode foil 1, and the inner cylinder fan blades 17 are composed of two arc-shaped plates in opposite directions. The outer cylinder 14 and the inner cylinder 13 are multiple segments, and the multiple segments of the outer cylinder 14 and the multiple segments of the inner cylinder 13 are connected as a whole and coaxially arranged by their respective cylinder connecting plates 21.

[0043] Based on embodiment 3, a power shaft 8 is fixedly installed at the end of the housing connector 7 near the outlet end cover 11, and the housing connector 7 is connected to the outlet end cover 11 through the power shaft 8. Under the action of the power shaft 8, a sufficient distance is maintained between the outlet end cover 11 and the end of the housing connector 7.

[0044] Based on Embodiment 3, an inner drive wheel 9 and an outer drive wheel 10 are connected to the power shaft 8 via bearing structures. The inner drive wheel 9 and outer drive wheel 10 can rotate under the drive of a synchronous belt. The inner drive wheel 9 engages with the end of the inner cylinder 13 at a corresponding position, and the outer drive wheel 10 engages with the outer cylinder 14 at a corresponding position. The end of the inner cylinder 13 is provided with a ring with meshing teeth; the end of the outer cylinder 14 is also provided with a ring with meshing teeth. The inner drive wheel 9 and outer drive wheel 10 respectively engage with the corresponding synchronous belt. The synchronous belt is arranged circumferentially around the gas distribution box 6 and the box connecting member 7, and engages with multiple inner drive wheels 9 and outer drive wheels 10 along the movement path of the synchronous belt.

[0045] Based on embodiment 3, the outer cylinder 14 and the inner cylinder 13 can be multiple segments and arranged along their own axial direction. Adjacent outer cylinders 14 and inner cylinders 13 are connected as a whole by cylinder connecting plates 21, which are distributed circumferentially on the outer cylinder 14 and the inner cylinder 13.

[0046] Example 4: Based on Examples 1 to 3, see below. Figures 1 to 9 A method for producing anode foil for aluminum electrolytic capacitors using an apparatus, comprising: the anode foil 1 entering a space formed by a gas distribution box 6 and a box body connector 7 through an inlet guide roller 2 and an inlet end cover 3; the inlet pipe 4 being connected to an external drying gas pipeline; the drying gas in the inlet pipe 4 being distributed into the gas distribution box 6 through the inlet distribution hole 19 of the inlet box 5; and the drying gas entering the corresponding box body outlet 15 under the action of the distribution partition 20 in the gas distribution box 6; the box body outlet 15 distributing the drying gas into the gas distribution box 6 and the box body connector 7. Within the space formed by the connecting parts 7; the inner cylinder 13 and the outer cylinder 14 rotate under the drive of the corresponding inner drive wheel 9 and outer drive wheel 10. The inner cylinder 13 and the outer cylinder 14 are coaxially arranged and rotate in opposite directions around the central axis; the inner cylinder fan blade 17 in the inner cylinder 13 distributes the drying gas to the position of the anode foil 1 and allows the drying gas to be discharged through the gap between the outer cylinder 14, the inner cylinder 13 and the outlet end cover 11; the anode foil 1 is guided out of the drying box or the inlet guide roller 2 in the next drying cylinder through the outlet on the outlet end cover 11 and the outlet guide roller 12 at the outlet position for secondary drying.

[0047] Although this application describes the technical solutions by way of preferred embodiments, those skilled in the art can rearrange and combine the technical solutions or technical features in the above embodiments based on their prior art. The new embodiments formed by rearranging and combining these features can still be considered within the scope of protection of this application and are protected by this application.

Claims

1. An apparatus for producing an anode foil for an aluminum electrolytic capacitor, comprising a drying oven, characterized by: The drying chamber is equipped with one or two drying cylinders connected in series via a frame. Each drying cylinder includes a box body connector (7) distributed circumferentially around the anode foil (1). The two ends of the box body connector (7) are fixedly provided with an inlet end cap (3) and an outlet end cap (11). A gas distribution box (6) is provided between adjacent box body connectors (7). The gas distribution box (6) is connected to the gas inlet pipe (4). A box body outlet (15) is provided on the inner wall of the gas distribution box (6) facing the anode foil (1). The gas distribution box (6) and the box body connector are... (7) An outer cylinder (14) and an inner cylinder (13) are also provided inside the enclosed space. The inner cylinder (13) is located inside the outer cylinder (14) and is coaxially arranged with the outer cylinder (14). The two ends of the outer cylinder (14) and the inner cylinder (13) are connected to the inlet end cap (3) and the outlet end cap (11) through a bearing structure. The outer cylinder (14) has a number of outer cylinder distribution holes (18) distributed on its circumferential outer wall. The two ends of the inner cylinder (13) are end rings (16), and a number of inner cylinder fan blades (17) are arranged between the end rings (16).

2. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 1, characterized in that: The inlet end cap (3) is provided with an inlet guide roller (2) at the inlet position of the anode foil (1), and the outlet end cap (11) is provided with an outlet guide roller (12) at the outlet position of the anode foil (1).

3. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 1, characterized in that: The gas distribution box (6) and the box body connector (7) form a cylindrical structure with open ends on the circumference of the anode foil (1). The gas distribution box (6) is a hollow box body. A box body outlet (15) with strip-shaped through holes is provided on the inner wall of the gas distribution box (6) facing the anode foil (1). The gas inlet pipe (4) is connected to the gas distribution box (6) through the gas inlet box (5). The gas inlet box (5) is located at the end of the gas distribution box (6), and the gas distribution box (6) is connected to the inlet end cap (3) through the gas inlet box (5).

4. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 3, characterized in that: The air inlet box (5) is provided with a plurality of air inlet distribution holes (19) at a position communicating with the gas distribution box (6); the gas distribution box (6) is provided with a distribution partition (20) corresponding to the air outlet (15) of the box body, and the distribution partition (20) divides the interior of the gas distribution box (6) into chambers corresponding to the air outlet (15) of the box body.

5. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 1, characterized in that: The box connector (7) is provided with a power shaft (8) at the end connected to the outlet end cover (11). The box connector (7) is connected to the outlet end cover (11) through the power shaft (8). The power shaft (8) is connected to an inner drive wheel (9) and an outer drive wheel (10) through a bearing structure. The inner drive wheel (9) meshes with the end ring (16) at the end of the inner cylinder (13) for transmission. The outer drive wheel (10) meshes with the end of the outer cylinder (14) for transmission. The inner drive wheel (9) and the outer drive wheel (10) are respectively connected to an external power device through a synchronous belt.

6. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 1, characterized in that: The inner cylinder fan blades (17) are located between the end ring (16) and the outer cylinder (14), and between the end ring (16) and the anode foil (1). The inner cylinder fan blades (17) are composed of two arc-shaped plates in opposite directions.

7. The apparatus for producing anode foil for aluminum electrolytic capacitors according to claim 1, characterized in that: The outer cylinder (14) and inner cylinder (13) are multiple segments. The multiple segments of the outer cylinder (14) and the multiple segments of the inner cylinder (13) are connected as a whole and coaxially arranged by their respective cylinder connecting plates (21).

8. A method for producing anode foil for aluminum electrolytic capacitors using an apparatus according to any one of claims 1 to 7, characterized in that, The method involves the anode foil (1) entering the space formed by the gas distribution box (6) and the box body connector (7) through the inlet guide roller (2) and the inlet end cap (3). The inlet pipe (4) is connected to the external drying gas pipeline. The drying gas in the inlet pipe (4) is distributed into the gas distribution box (6) through the inlet distribution hole (19) of the inlet box (5). Under the action of the distribution partition (20) in the gas distribution box (6), the drying gas enters the corresponding box body outlet (15). The box body outlet (15) distributes the drying gas into the space formed by the gas distribution box (6) and the box body connector (7). The inner cylinder (13) and outer cylinder (14) rotate under the drive of the corresponding inner drive wheel (9) and outer drive wheel (10). The inner cylinder (13) and outer cylinder (14) are coaxially arranged and rotate in opposite directions around the central axis. The inner cylinder fan blade (17) in the inner cylinder (13) distributes the drying gas to the position of the anode foil (1) and makes the drying gas discharged through the gap between the outer cylinder (14), the inner cylinder (13) and the outlet end cap (11). The anode foil (1) is guided out of the drying box or the inlet guide roller (2) in the next drying cylinder through the outlet on the outlet end cap (11) and the outlet guide roller (12) at the outlet position for secondary drying.

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